Help please, Rear drop shocks won’t stretch far enough

[64 rust]

Hey guys, I’m needing some help here. I just put in a 71 rear end in my 64, I also installed 5 inch drop springs, 1.5” blocks, shock relocation brackets, and new shocks...Everything was going smooth until it was time to hook the bottom of the shock to the relocation bracket and it doesn’t stretch far enough. This kit came off of the 71 with the rear end so should all fit, only thing I added are the lowering blocks. It does look like I’m about 1.5” off. Could that be it and I need longer drop shocks or am I completely missing something?? I have read and watched thread after thread trying to find a solution, any help is greatly appreciated. I measured the shock extended at 13.5” if that helps.
Posted via Mobile Device